Aeroflex ATC-1400A-2 - Page 32

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 3 2
Subj e c t to E x p o rt Con t r o l, s e e C o ver P a g e fo r d e tail s . F e b 2/ 0 9
STEP PROCEDURE
68. Us i n g Osci l l o sco p e , ve r i f y p u l s e s p a c ing i s 19. 9 µs (±0. 1 5 µs ) .
69. Sl o w l y inc r e a s e Du a l P uls e G e n e rat o r out p u t pu l s e spa c i n g t o t h res h o l d whe r e
"F" d i s a ppea r s , the n j u st r e a p p ears o n DISPL A Y S ELECT R e a d out.
70. Us i n g Osci l l o sco p e , ve r i f y p u l s e s p a c ing i s 20. 8 µs (±0. 1 5 µs ) .
71. Set D E C O D E R W I D E / N A R R O W S w itc h t o NARR O W .
72. Se t D u a l Pu l s e Gener a t o r ou t p u t pu l s e spac i n g for 2 0 .19 µs ( ±1 0 ns) .
73. Ad j u s t R327 ( W indo w P o s iti o n A djus t ) (2-2 - 2 , Fig u r e 25) a s nee d e d unt i l " F"
appe a r s at o n e h alf b r i g htn e s s (fli c k e r ing ) o n DISPL A Y S ELE CT R e a d out.
74. Se t D u a l Pu l s e Gener a t o r ou t p u t pu l s e spac i n g for 2 0 .410 µs (±10 n s ) .
75. Ad j u s t R330 ( W i ndo w W i d th A d j u s t) ( 2 - 2 -2, F i g ure 2 5 ) as n e e d ed u n t i l "F "
appe a r s at o n e h alf b r i g htn e s s (fli c k e r ing ) o n DISPL A Y S ELE CT R e a d out.
76. Set POW E R S w i t ch t o O F F .
77. Dis c o n nec t t e st e q u ipment .